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<article class='withtoc'>
    <h1>
      ControllerBuilder
      <a class="edit-page-link" href="https://github.com/liaohuqiu/fresco-docs-cn/blob/docs/docs/01-using-controllerbuilder.md" target="_blank">编辑和纠错</a>
    </h1>
    <p></p>

    <p><code>SimpleDraweeView</code> 有两个方法可以设置所要加载显示图片，简单的方法就是<code>setImageURI</code>。</p>

<p>如果你需要对加载显示的图片做更多的控制和定制，那就需要用到<a href="concepts.html#DraweeController">DraweeController</a>，本页说明如何使用。</p>

<h3>DraweeController</h3>

<p>首先，创建一个DraweeController, 然后传递图片加载请求给<a href="../javadoc/reference/com/facebook/drawee/backends/pipeline/PipelineDraweeControllerBuilder.html">PipelineDraweeControllerBuilder</a>. </p>

<p>随后，你可以控制controller的其他选项了:</p>
<div class="highlight"><pre><code class="language-java" data-lang="java"><span class="n">ControllerListener</span> <span class="n">listener</span> <span class="o">=</span> <span class="k">new</span> <span class="nf">BaseControllerListener</span><span class="o">()</span> <span class="o">{...}</span>

<span class="n">DraweeController</span> <span class="n">controller</span> <span class="o">=</span> <span class="n">Fresco</span><span class="o">.</span><span class="na">newDraweeControllerBuilder</span><span class="o">()</span>
    <span class="o">.</span><span class="na">setUri</span><span class="o">(</span><span class="n">uri</span><span class="o">)</span>
    <span class="o">.</span><span class="na">setTapToRetryEnabled</span><span class="o">(</span><span class="kc">true</span><span class="o">)</span>
    <span class="o">.</span><span class="na">setOldController</span><span class="o">(</span><span class="n">mSimpleDraweeView</span><span class="o">.</span><span class="na">getController</span><span class="o">())</span>
    <span class="o">.</span><span class="na">setControllerListener</span><span class="o">(</span><span class="n">listener</span><span class="o">)</span>
    <span class="o">.</span><span class="na">build</span><span class="o">();</span>

<span class="n">mSimpleDraweeView</span><span class="o">.</span><span class="na">setController</span><span class="o">(</span><span class="n">controller</span><span class="o">);</span>
</code></pre></div>
<p>在指定一个新的controller的时候，使用<code>setOldController</code>，这可节省不必要的内存分配。</p>

<p>更多细节:</p>

<ul>
<li><a href="listening-download-events.html">Controller Listeners</a></li>
</ul>

<h3><a name="ImageRequest"></a>自定义图片加载请求</h3>

<p>在更进一步的用法中，你需要给Image pipeline 发送一个ImageRequest。下面是一个图片加载后，<a href="modifying-image.html">使用后处理器(postprocessor)</a> 进行图片后处理的例子.</p>
<div class="highlight"><pre><code class="language-java" data-lang="java"><span class="n">Uri</span> <span class="n">uri</span><span class="o">;</span>
<span class="n">Postprocessor</span> <span class="n">myPostprocessor</span> <span class="o">=</span> <span class="k">new</span> <span class="nf">Postprocessor</span><span class="o">()</span> <span class="o">{</span> <span class="o">...</span> <span class="o">}</span>
<span class="n">ImageRequest</span> <span class="n">request</span> <span class="o">=</span> <span class="n">ImageRequestBuilder</span><span class="o">.</span><span class="na">newBuilderWithSource</span><span class="o">(</span><span class="n">uri</span><span class="o">)</span>
    <span class="o">.</span><span class="na">setPostprocessor</span><span class="o">(</span><span class="n">myPostprocessor</span><span class="o">)</span>
    <span class="o">.</span><span class="na">build</span><span class="o">();</span>

<span class="n">DraweeController</span> <span class="n">controller</span> <span class="o">=</span> <span class="n">Fresco</span><span class="o">.</span><span class="na">newDraweeControllerBuilder</span><span class="o">()</span>
    <span class="o">.</span><span class="na">setImageRequest</span><span class="o">(</span><span class="n">request</span><span class="o">)</span>
    <span class="o">.</span><span class="na">setOldController</span><span class="o">(</span><span class="n">mSimpleDraweeView</span><span class="o">.</span><span class="na">getController</span><span class="o">())</span>
    <span class="c1">// 其他设置</span>
    <span class="o">.</span><span class="na">build</span><span class="o">();</span>
</code></pre></div>
<p>更多细节:</p>

<ul>
<li><a href="modifying-image.html">后处理器(Postprocessors)</a></li>
<li><a href="requesting-multiple-images.html">加载多个图片</a></li>
<li><a href="resizing-rotating.html">缩放和旋转图片</a></li>
</ul>


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